Can ping out but cannot receive Post: 303021955

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Top Forums UNIX for Beginners Questions & Answers Can ping out but cannot receive Post 303021955 by rbatte1 on Tuesday 21st of August 2018 12:28:33 PM

08-21-2018

Moderator

You are proving that you can lookup the DNS name to give you an IP address and indeed you may be sending packets and requests out from your server, but zero packets received means:-

The target IP is not active
There is no route to the target IP (you mention google.com but then a 172.x.x.x private address)
Your outbound IP tables may filter them out
Your network devices may filter them out
The target IP may ignore you
The target IP may try to respond but your public-facing proxy may filter them out
The target IP may try to respond but your internal network devices may filter them out
The target IP may try to respond but your inbound IP tables may filter them out

A ping is one type of packet, so it does not guarantee that you will actually be able to hold a conversation with the target address.

What is your eventual intention for which I presume that this is a step? Perhaps there is a better way to be monitoring what it is that you really need.

Kind regards,
Robin

rbatte1

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LEARN ABOUT DEBIAN

ocf_pacemaker_ping

OCF_PACEMAKER_PING(7)					      Pacemaker Configuration					     OCF_PACEMAKER_PING(7)

NAME

       ocf_pacemaker_ping - node connectivity

SYNOPSIS

       [OCF_RESKEY_pidfile=string] [OCF_RESKEY_dampen=integer] [OCF_RESKEY_name=string] [OCF_RESKEY_multiplier=integer]
       [OCF_RESKEY_host_list=string] [OCF_RESKEY_attempts=integer] [OCF_RESKEY_timeout=integer] [OCF_RESKEY_options=string]
       [OCF_RESKEY_debug=string]

       ping [start | stop | reload | monitor | meta-data | validate-all]

DESCRIPTION

       Every time the monitor action is run, this resource agent records (in the CIB) the current number of ping nodes the host can connect to. It
       is essentially the same as pingd except that it uses the system ping tool to obtain the results.

SUPPORTED PARAMETERS

       OCF_RESKEY_pidfile = string [/ping-]
	   PID file

       OCF_RESKEY_dampen = integer [5s]
	   Dampening interval

	   The time to wait (dampening) further changes occur

       OCF_RESKEY_name = string [pingd]
	   Attribute name

	   The name of the attributes to set. This is the name to be used in the constraints.

       OCF_RESKEY_multiplier = integer []
	   Value multiplier

	   The number by which to multiply the number of connected ping nodes by

       OCF_RESKEY_host_list = string []
	   Host list

	   The list of ping nodes to count.

       OCF_RESKEY_attempts = integer [2]
	   no. of ping attempts

	   Number of ping attempts, per host, before declaring it dead

       OCF_RESKEY_timeout = integer [2]
	   ping timeout in seconds

	   How long, in seconds, to wait before declaring a ping lost

       OCF_RESKEY_options = string []
	   Extra Options

	   A catch all for any other options that need to be passed to ping.

       OCF_RESKEY_debug = string [false]
	   Verbose logging

	   Enables to use default attrd_updater verbose logging on every call.

AUTHOR

       Andrew Beekhof <andrew@beekhof.net>
	   Author.

Pacemaker Configuration 					    04/17/2012						     OCF_PACEMAKER_PING(7)